Application of endoscopic retrograde cholangiopancreatography in the diagnosis and treatment of pediatric common bile duct stone disease

Table 2 Hematological parameters before and after endoscopic retrograde cholangiopancreatography in pediatric patients, mean ± SD/median (interquartile range)

Parameter	Preoperative	Postoperative	T/Z value	P value
WCC (× 109/L)	6.96 ± 2.01	7.68 ± 2.54	-1.21	0.23
Tbil (μmmol/L)	85.47 ± 26.83	42.15 ± 12.69	9.40	< 0.01
Dbil (μmmol/L)	38.92 (35.14, 45.61)	19.87 (15.42, 23.75)	4.72	< 0.01
AST (U/L)	268.5 (255.3, 275.1)	124.6 (118.9, 130.2)	4.70	< 0.01
ALT (U/L)	310.8 (308.4, 335.2)	172.3 (165.8, 185.6)	5.04	< 0.01
GGT (U/L)	218.6 ± 82.4	100.4 ± 38.5	8.16	< 0.01
AMY (U/L)	90.14 ± 77.40	108.09 ± 100.16	-1.04	0.29

WCC: White cell count; Tbil: Total bilirubin; Dbil: Direct bilirubin; AST: Aspartate aminotransferase; ALT: Alanine aminotransferase; GGT: γ-glutamyltransferase; AMY: Amylase.